SIRIUS S2 contactor for 24 VDC coil circuits
The Siemens SIRIUS 3RT2535-1NP30 is a size S2 contactor with a 24 V rated coil drawing 10 A at rated value, designed for screw-type coil terminals and snap-on mounting onto 35 mm DIN rail per DIN EN 50022. Rated auxiliary contact current at 230 V is 6 A, at 400 V is 3 A, and at 440 V is 1 A — covering common control and small motor circuits in European panels. The contactor carries an auxiliary switch as standard, and its screw-type coil terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire.
Panel fit and mounting flexibility
Dimensions: 75 mm wide, 114 mm high, 130 mm deep. Clearance requirements: 50 mm above and below, 10 mm to the side, 0 mm forward/backward for arc flash containment.
The coil rated voltage is 175 to 280 V AC/DC, with a pick-up factor of 0.8 and a drop-out factor of 1.1. Maximum mechanical switching rate at AC-1 duty is 350 operations per hour. Typical mechanical life is 10,000,000 cycles. Inrush current peak is 25 A. Power factor at 50/60 Hz is 0.95 — near-unity, meaning minimal reactive load on the control transformer.